在下面的第一个块中，我故意错过命名我的一个绑定语句，所以我可以比较我的第二个块。区别在于'ag2.item ...'行中找不到属性 item是我的模特。
在块2中，您可以看到它指向我的视图模型（ag2.viewModel.itemViewModel）。
我需要在XAML或我的代码隐藏中做些什么才能让它指向我的类而不是viewmodel？
第1区：
BindingExpression路径错误：找不到'itemModel1'属性 'ag2.item，ag2，Version = 1.0.0.0，Culture = neutral， 公钥=空”。 BindingExpression：Path ='itemModel1' DataItem ='ag2.item ，ag2，版本= 1.0.0.0， Culture = neutral，PublicKeyToken = null';目标元素是 'Windows.UI.Xaml.Controls.TextBlock'（Name ='null'）;目标属性是 'Text'（输入'String'）
第2栏：
BindingExpression路径错误：找不到'itemModel'属性 'ag2.viewModel.itemViewModel，ag2，Version = 1.0.0.0，Culture = neutral， 公钥=空”。 BindingExpression：Path ='itemModel' DataItem ='ag2.viewModel.itemViewModel，ag2，Version = 1.0.0.0， Culture = neutral，PublicKeyToken = null';目标元素是 'Windows.UI.Xaml.Controls.TextBlock'（Name ='null'）;目标属性是 '来源'（输入'String'）
第2块代码：
itemViewModel VM = new itemViewModel((Int32)navigationParameter);
DataContext = VM;
我还应该注意到，在块1中，我正在绑定到设置了ItemSource="{Binding item}"的GridView。
在第2块中，我使用以下网格使用网格和文本块构建了我的UI：Text="{Binding Path=itemModel}"
更新：努力寻求更好的理解。我把我的代码放在那里：下面是XAML，下面是ViewModel，下面是我的模型......我是MVVM的新手，所以我真的不知道我做错了什么。非常感谢任何帮助。
XAML：
<common:LayoutAwarePage
x:Name="pageRoot"
x:Class="autoGarage2.VehicleItemDetailPage"
IsTabStop="false"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:common="using:autoGarage2.Common"
xmlns:local="using:autoGarage2"
xmlns:data="using:autoGarage2"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
<!--
This grid acts as a root panel for the page that defines two rows:
* Row 0 contains the back button and page title
* Row 1 contains the rest of the page layout
-->
<Grid Style="{StaticResource LayoutRootStyle}">
<Grid.RowDefinitions>
<RowDefinition Height="140"/>
<RowDefinition Height="2*"/>
</Grid.RowDefinitions>
<!-- Back button and page title -->
<Grid
Style="{StaticResource LayoutRootStyle}" Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button x:Name="backButton" Click="GoBack" IsEnabled="{Binding Frame.CanGoBack, ElementName=pageRoot}" Style="{StaticResource BackButtonStyle}"/>
<TextBlock x:Name="pageTitle" Text="{StaticResource AppName}" Style="{StaticResource PageHeaderTextStyle}" Grid.Column="1"/>
</Grid>
<Grid Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="3*"/>
<RowDefinition Height="1*"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal" Width="auto" Margin="50,0,0,0" VerticalAlignment="Top" >
<Grid HorizontalAlignment="Left" Width="250" Height="250">
<Border Background="White" BorderBrush="CornflowerBlue" BorderThickness="1">
<Image Source="{Binding Image}" Margin="50"/>
</Border>
<StackPanel VerticalAlignment="Bottom" Background="CornflowerBlue">
<StackPanel Orientation="Horizontal" DataContext="{Binding vehicles}">
<TextBlock Text="{Binding VehicleMake}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource PageSubheaderTextStyle}" Margin="5"/>
<TextBlock Text="{Binding VehicleModel}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource PageSubheaderTextStyle}" Margin="5"/>
</StackPanel>
</StackPanel>
</Grid>
</StackPanel>
<StackPanel Grid.Row="0" Grid.Column="1">
<Grid Margin="20,0,0,20">
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
<TextBlock Text="Vehicle Make:" Grid.Row="0" Grid.Column="0" FontSize="25" Foreground="Black" />
<TextBox Text="{Binding Path=VehicleMake}" Grid.Row="0" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="Vehicle Model:" FontSize="25" Foreground="Black" Grid.Row="1" Grid.Column="0"/>
<TextBox Text="{Binding VehicleModel}" Grid.Row="1" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="Vehicle Year:" FontSize="25" Foreground="Black" Grid.Row="2" Grid.Column="0"/>
<TextBox Text="{Binding VehicleYear}" Grid.Row="2" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="License Plate:" FontSize="25" Foreground="Black" Grid.Row="3" Grid.Column="0"/>
<TextBox Text="" Grid.Row="3" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="VIN #" FontSize="25" Foreground="Black" Grid.Row="4" Grid.Column="0"/>
<TextBox Text="" Grid.Row="4" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1" />
<TextBlock Text=" Current Mi/Km" FontSize="25" Foreground="Black" Grid.Row="5" Grid.Column="0"/>
<TextBox Text="" Grid.Row="5" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="" FontSize="25" Foreground="Black" Grid.Row="6" Grid.ColumnSpan="2"/>
<TextBlock Text="Last Oil Change" FontSize="25" Foreground="Black" Grid.Row="7" Grid.Column="0"/>
<TextBox Text="" Grid.Row="7" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="Last Oil Change Mi/Km" FontSize="25" Foreground="Black" Grid.Row="8" Grid.Column="0"/>
<TextBox Text="" Grid.Row="8" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="" FontSize="25" Foreground="Black" Grid.Row="9" Grid.ColumnSpan="2"/>
<TextBlock Text="Reminder Mi/Km" FontSize="25" Foreground="Black" Grid.Row="10" Grid.Column="0"/>
<TextBox Text="" Grid.Row="10" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
<TextBlock Text="Reminder Month(s)" FontSize="25" Foreground="Black" Grid.Row="11" Grid.Column="0"/>
<TextBox Text="" Grid.Row="11" Grid.Column="1" FontSize="25" BorderBrush="CornflowerBlue" BorderThickness="1"/>
</Grid>
</StackPanel>
</Grid>
</Grid>
</common:LayoutAwarePage>
查看型号：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.ObjectModel;
using Windows.Foundation.Collections;
using System.IO;
namespace autoGarage2.viewModel
{
class vehicleViewModel
{
private IList<vehicle> m_vehicles;
private IList<vehicle> m_vehicleItem;
public IList<vehicle> vehicles
{
get { return m_vehicles; }
set { m_vehicles = value; }
}
public IList<vehicle> vehicleItem
{
get { return m_vehicleItem; }
set { m_vehicleItem = value; }
}
private IList<vehicle> getVehicleDetail(Int32 vId)
{
var vehicleItem =
from v in vehicles
where v.VehicleId == vId
select v;
if (vId > 0)
{
//vehicles.Clear();
m_vehicles = new List<vehicle>();
foreach (var item in vehicleItem)
{
m_vehicles = new List<vehicle>
{
new vehicle(item.VehicleId, item.VehicleMake.ToString(), item.VehicleModel.ToString(), item.VehicleYear, item.Image.ToString())
};
//vehicle myVehicle = new vehicle(item.VehicleId, item.VehicleMake.ToString(), item.VehicleModel.ToString(), item.VehicleYear, item.Image.ToString());
//m_vehicles.Add(myVehicle);
}
}
return m_vehicles;
}
public vehicleViewModel(Int32 vId)
{
m_vehicles = new List<vehicle>
{
new vehicle(1, "Mazda", "3", 2011, "Assets/car2.png"),
new vehicle(2, "Chevy", "Tahoe", 2004, "Assets/jeep1.png"),
new vehicle(3, "Honda", "Goldwing", 2007 ,"Assets/moto1.png")
};
if (vId > 0)
{
//m_vehicles = new List<vehicle>();
//m_vehicles =
//getVehicleDetail(vId);
m_vehicles = new List<vehicle>
{
new vehicle(2, "Chevy", "Tahoe", 2004, "Assets/jeep1.png"),
};
}
}
#region dbCode
//string dbName = "vehicle.db";
//var dbPath = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, dbName);
//using (var db = new SQLite.SQLiteConnection(dbPath))
// {
// var list = db.Table<vehicle>().ToList();
// m_vehicles = new List<vehicle>();
// for (Int32 i = 0; i < list.Count; i++)
// {
// //m_vehicles.Add(db.Table<vehicle>().ToList());
// }
// }
//foreach (vehicle item in m_vehicles)
//{
// AllItems.Add(item);
//}
#endregion
}
}
型号：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//using SQLite;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
namespace autoGarage2
{
class vehicle : autoGarage2.Common.BindableBase
{
public vehicle()
{
}
public vehicle(string imagePath)
{
this._imagePath = imagePath;
}
public vehicle(Int32 vId, string vMake, string vModel, Int16 vYear, string imagePath)
{
this.m_vehicleID = vId;
this.m_vehicleMake = vMake;
this.m_vehicleModel = vModel;
this.m_vehicleYear = vYear;
this.m_vehicleName = vMake + " " + vModel;
this._imagePath = imagePath;
}
private Int32 m_vehicleID;
private String m_vehicleMake;
private String m_vehicleModel;
private Int16 m_vehicleYear;
private string m_vehicleName;
private ImageSource _image = null;
private String _imagePath = null;
private static Uri _baseUri = new Uri("ms-appx:///");
//[AutoIncrement, PrimaryKey]
public Int32 VehicleId
{
get
{
return m_vehicleID;
}
set
{
m_vehicleID = value;
OnPropertyChanged("VehicleId");
}
}
public String VehicleMake
{
get
{
return m_vehicleMake;
}
set
{
m_vehicleMake = value;
OnPropertyChanged("VehicleMake");
}
}
public String VehicleModel
{
get
{
return m_vehicleModel;
}
set
{
m_vehicleModel = value;
OnPropertyChanged("VehicleModel");
}
}
public Int16 VehicleYear
{
get
{
return m_vehicleYear;
}
set
{
m_vehicleYear = value;
OnPropertyChanged("VehicleYear");
}
}
public string VehicleName
{
get
{
return m_vehicleName;
}
set
{
m_vehicleName = value;
OnPropertyChanged("VehicleName");
}
}
public ImageSource Image
{
get
{
if (this._image == null && this._imagePath != null)
{
this._image = new BitmapImage(new Uri(vehicle._baseUri, this._imagePath));
}
return this._image;
}
set
{
this._imagePath = null;
this.SetProperty(ref this._image, value);
}
}
public void SetImage(String path)
{
this._image = null;
this._imagePath = path;
this.OnPropertyChanged("Image");
}
}
}
答案 0 :(得分：1)
听起来您正试图将TextBlock数据绑定到另一个对象，而不是ViewModel（它是您的窗口/控件的DataContext）。如果这是正确的，您需要将DataContext或父TextBlock的{{1}}设置为您想要DataBind的对象。
Grid用于确定控件的DataBind路径，并继承可视树。因此，如果您的DataContext设置为MyViewModel，而您使用DataContext，那么您的绑定路径将为Text="{Binding Path=itemModel}"。
如果您不想在绑定路径中包含MyViewModel.itemModel，则需要更改相关控件的MyViewModel或包含控件的DataContext。对于MVVM，通常通过将其他对象作为ViewModel的属性公开来完成。因此，如果您的MyViewModel具有属性ItemModel：
public class ItemModel
{
public string Property1 { get; }
public string Property2 { get; }
}
public class MyViewModel
{
public ItemModel ItemModel { get; private set; }
}
然后你的XAML看起来像这样（假设MyViewModel是父窗口/控件的DataContext）。
<Grid Grid.Row="1" DataContext="{Binding ItemModel}">
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text="{Binding property1}"/>
<TextBlock Text="{Binding Property2}" Grid.Row="1"/>
</Grid>
两个文本框将绑定到ItemModel对象的Property1和Property2。
答案 1 :(得分：1)
您似乎尝试绑定到列表，但您没有在XAML中使用任何ItemsControl。您可能应该使用类似ListView的东西，将其ItemsSource绑定到您的车辆或vehicleItem列表，使用ItemTemplate / DataTemplate定义集合中每个项目的外观，如果您的集合更改或使用ObotableCollection，则使用ObservableCollection INotifyPropertyChanged.PropertyChanged如果你换掉你的收藏等通知。否则我建议你阅读一些关于绑定ItemsControls或关于XAML的一般书籍，比如Adam Nathan的WPF Unleashed。看起来你只是设置m_vehicles来在下一个语句中用新的m_vehicles替换它。另外 - 你将StackPanel的DataContext设置为你的列表，这是允许的，但它不起作用，因为StackPanel元素的DataContext仍然是整个列表而不是它的项目，这就是你得到的使用ItemsControl。
答案 2 :(得分：0)
在没有看到它的周末之后，我能够显示我的数据。基本上我注意到我收到一个绑定错误，表示它无法在我的autoGarage2.vehicles列表中找到该属性。所以对于笑容，我开始这样的绑定：
{Binding vehicles[0].vehicleModel}
下次我运行时，数据就在那里。在考虑了一些之后，我决定创建一个单一的车辆对象，而不是填充列表对象，我只填充单个车辆属性。现在我正在做这样的事情：
{Binding vehicleSingle.vehicleModel}
感谢每一个人的帮助。我想这只是MVVM如何在XAML中运行的细微差别......